How to Insert All Datagridview data to Sql DataBase from Excel Using c#

{
  SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AirtelMis"].ConnectionString);

  try
  {
    con.Open();
    SqlCommand cmd = con.CreateCommand();
    cmd.CommandText = "insert into Airm1 values" + "(@SlNo, @name, @age,@amount,@Chqdate)";
    cmd.Parameters.Add("@SlNo", SqlDbType.VarChar);
    cmd.Parameters.Add("@Name", SqlDbType.VarChar);
    cmd.Parameters.Add("@age", SqlDbType.VarChar);
    cmd.Parameters.Add("@amount", SqlDbType.Decimal,2); 
    cmd.Parameters.Add("@Chqdate", SqlDbType.Date);
                

    for (int i = 0; i < dataGridView1.Rows.Count-1; i++)
    {
      cmd.Parameters["@SlNo"].Value = this.dataGridView1[0,i].Value;
      cmd.Parameters["@name"].Value = this.dataGridView1[1,i].Value;
      cmd.Parameters["@age"].Value = this.dataGridView1[2,i ].Value;
      cmd.Parameters["@amount"].Value = this.dataGridView1[3, i].Value;
      cmd.Parameters["@Chqdate"].Value = this.dataGridView1[4, i].Value;
                        
      cmd.ExecuteNonQuery();
      MessageBox.Show("Data Export Sucessfully", "My Application",
MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
    }
    this.Close();
  }
  catch (SqlException er)
  {
    MessageBox.Show("Error:" + er.ToString());
  }
}